Rotating an object that over time starts speeding up? [Solved]

I'm scripting a fan that lets the fan blades rotate around repeatedly at a specified pace. My problem is that the fan blades start to speed up over time.

blades = script.Parent:GetChildren()
spinSpeed = 0.005
mathStart = 0 --angle start?
mathSpinRate = 0.005

while true do
	for _,v in pairs(blades) do
		if v.Name == "Union" then
				v.CFrame = v.CFrame * CFrame.Angles(0,math.rad(mathSpinRate),0)
				mathStart = mathStart+mathSpinRate
		end
	end
	wait(spinSpeed)
end

on line number 10 you have mathStart = mathStart + mathSpinRate which then starts to stack the value upon itself.

try mathStart = mathSpinRate instead.